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<h1 class="topictitle1">Disks Fail to Be Opened Using VDDK During VMware VM Backup</h1>
<div><div class="section"><h4 class="sectiontitle">Symptom</h4><p>During a VMware VM backup job, disks fail to be opened using VDDK. In subsequent backup jobs, VDDK fails to be initialized.</p>
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<div class="section"><h4 class="sectiontitle">Possible Causes</h4><p>The number of VM disks opened in NBDSSL mode on a single ESXi host reaches the upper limit of 52.</p>
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<div class="section"><h4 class="sectiontitle">Troubleshooting</h4><ol><li><span>Restart the client service.</span><p><ol type="a"><li>Use PuTTY to log in to the host where the client is to be installed as user <strong id="EN-US_TOPIC_0000002164814062__en-us_topic_0000002164790296_en-us_topic_0000002200031305_b916917212">root</strong>.</li><li>Run the following command to go to the <strong id="EN-US_TOPIC_0000002164814062__en-us_topic_0000002200116653_b14842192941413">ProtectClient</strong> directory:<div class="note" id="EN-US_TOPIC_0000002164814062__en-us_topic_0000002200116653_note13958111815513"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="EN-US_TOPIC_0000002164814062__en-us_topic_0000002200116653_en-us_topic_0000001792390220_p1655195845015"><span id="EN-US_TOPIC_0000002164814062__en-us_topic_0000002200116653_ph58441642194017">In the command, <em id="EN-US_TOPIC_0000002164814062__en-us_topic_0000002200116653_en-us_topic_0000002164630536_i2153220484">/opt</em> is the default installation directory of the client. Replace it with the actual installation directory.</span> The following operations use <strong id="EN-US_TOPIC_0000002164814062__en-us_topic_0000002200116653_b925794917581">/opt</strong> as an example.</p>
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<pre class="screen" id="EN-US_TOPIC_0000002164814062__en-us_topic_0000002200116653_screen79234411411">cd /opt/DataBackup/ProtectClient</pre>
</li><li>Run the following command to stop the client service:<pre class="screen" id="EN-US_TOPIC_0000002164814062__en-us_topic_0000002200116653_screen39264412140">sh stop.sh</pre>
</li><li>Run the following command to start the client service:<pre class="screen">sh start.sh</pre>
</li></ol>
</p></li><li><span>Perform the backup job again. If the problem persists, reinstall the client.</span></li></ol>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="en-us_topic_0000002200054965.html">FAQs</a></div>
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